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7.4 Valve Drive
7.4.1 Valve clearance – Check and adjustment
Preconditions
☑Engine is stopped and starting disabled.
☑Engine coolant temperature is max. 40 °C.
☑Valves are closed.
Special tools, Material, Spare parts
Designation / Use
Valve clearance gage
Barring gear
Ratchet with extension
Double box wrench
Offset screwdriver
Socket wrench
Torque wrench, 10-60 Nm
Measuring device
Preparatory steps
u
Remove cylinder head cover (→ Page 50).
Positioning A1 piston at TDC
Note:
With cylinder head and valve gear installed.
1.
Install dial gage (2) under preload in meas-
uring device (4) and clamp with screw (1).
2.
Install measuring device (4) in cylinder
head and secure using knurled-head
screw (3).
3.
Zero dial gage (2).
4.
Turn engine using barring gear until piston
A1 reaches firing TDC.
Result:
The piston is at firing TDC when both rock-
er arms are unloaded, i.e. have clearance.
Checking valve clearance at two crankshaft positions
1.
Check TDC position of piston in cylinder A1:
• If the rocker arms are unloaded on cylinder A1, the piston is in firing TDC.
• If the rocker arms are loaded on cylinder A1, the piston is in overlap TDC.
2.
Check valve clearance with cold engine:
• Inlet (I) = 0.3 mm;
• Exhaust (X) = 0.4 mm.
48 | Task Description | MS150117/01E 2014-10
Part No.
Qty.
Y4345893
1
F6792910
1
F30006212
1
F30002800
1
F30453001
1
F30030450
1
F30510423
1
Y4348409
1
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